string[] stacktrace = Environment.StackTrace.Replace("r", "").Replace("n", "").Replace("  at", "n").Split('n');
string stack = "";

for (int i = 0; i < stacktrace.Length; i++)
    stack += stacktrace[i].Trim() + "rn";

Error err = new Error();
err.Severity = (byte)sev;
err.Product = (byte)prod;
err.Location = stacktrace[0];
err.Title = message;
err.datetime = DateTime.Now;
err.StackTrace = stack;

dc.Errors.InsertOnSubmit(err);
dc.SubmitChanges();

[Column(Storage="_ID", AutoSync=AutoSync.OnInsert, DbType="Int NOT NULL IDENTITY", IsPrimaryKey=true, IsDbGenerated=true)]
public int ID // ...
[Column(Storage="_AID", DbType="Int")]
public System.Nullable<int> AID // ...
[Column(Storage="_Severity", DbType="TinyInt NOT NULL")]
public byte Severity
[Column(Storage="_Product", DbType="TinyInt NOT NULL")]
public byte Product
[Column(Storage="_Location", DbType="VarChar(255) NOT NULL", CanBeNull=false)]
public string Location
[Column(Storage="_Title", DbType="VarChar(255) NOT NULL", CanBeNull=false)]
public string Title
[Column(Storage="_Ex", DbType="Text", UpdateCheck=UpdateCheck.Never)]
public string Ex
[Column(Storage="_Notes", DbType="Text", UpdateCheck=UpdateCheck.Never)]
public string Notes
[Column(Storage="_datetime", DbType="DateTime NOT NULL")]
public System.DateTime datetime
[Column(Storage="_InnerException", DbType="Text", UpdateCheck=UpdateCheck.Never)]
public string InnerException
[Column(Storage="_StackTrace", DbType="Text", UpdateCheck=UpdateCheck.Never)]
public string StackTrace

[Association(Name="Activity_Error", Storage="_Activity", ThisKey="AID", IsForeignKey=true)]
public Activity Activity